The financials of it isn't the end of it, though. The nightlife is better, the people are nicer, I can have a backyard, I'm not severely limiting my options by having dogs, and the weather is better (for me, but I'm used to hot). I'm significantly happier in Austin.
[1]: My 2-bedroom house that I live in by myself costs about what I was paying for my share of a 2-bedroom apartment in SF. Both required about a 10 minute commute, though I drive in Austin where I could walk in SF. It extends beyond rent, though. Everything in SF is more expensive, though nothing is quite as dramatic as the rent.
Furthermore, if you're fitness, there are so many running clubs, core classes and cycling races that go on.
Note: I moved to the bay area for a couple years before heading back to Austin (I lived in Austin for a decade before wanting to try out the bay area, no idea why people like it so much).